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Known differences between ACD model in GlastRelease and Reality

  • Overlaps between top tiles go in the wrong direction
  • Screws are not simulated
  • Curvature of top tiles is not modeled. We have tentatively agreed with the ACD to simulate this through the introduction of a vertical box.
  • Shingling along the sides is not included.

Testing the leakage of the ACD geometry as currently simulated in GlastRelease - Oct2005

Outcome of conference call between Bill Atwood, Heather Kelly, Alex Moiseev, and Steve Ritz on Oct 19, 2005

Before proceeding with large scale background rejection studies, Bill needs to be assured that the ACD geometry model as simulated in GlastRelease is worst case in terms of leakage. It is strongly believed that Alex's Geant3 simulation is more accurate. Interested in demonstrating that when the ACD model in GlastRelease is "improved" to adhere to the full design, that new sources of leakage will not be introduced.

The Plan

Provide a direct comparison between Alex's Geant3 simulation and what is currently in use in GlastRelease. If we can demonstrate that the GlastRelease model is the same or slightly worse than Alex's Geant3 simulation, Bill will be satisfied. We spent the rest of the call outlining the details of a run to be performed using both simulations. Alex will forward a final set of details via email.

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